[ECOS] Configuring PCI devices

[David Brennan <eCos at brennanhome dot com>]

I am trying to write a "device driver" for the Tundra Universe II chip. 
I am using a "public" linux driver for guidance. I was trying to use 
cyg_pci_read_uint32 to read the custom configuration registers for this 
chip, but found that was not working. On further investigation, I 
realized that offset is only a cyg_uint8. Since I am trying to access 
registers with an offset greater than 256, what is the preferred method 
of accessing these?

The Linux code dereferences from the bar[0] address directly, then adds 
the offset, and reads the value with a readl macro call. Is that 
"acceptable" under eCos. I am writing this for a i386 pc platform. But 
if its possible to make it "cross platformable" I'm willing to work 
within the eCos HAL restrictions.

Thanks
David Brennan

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